TITLE OF THE EXPERIMENT: Simulation of RC Phase shift Oscillator and Hartley
oscillator using PSpice.
AIM OF THE EXPERIMENT: To Design and Simulate RC Phase oscillator and Hartley
Oscillator.
Software tool used: PSpice Schematics Version 9.1
CIRCUIT DIAGRAM: RC Phase Shift Oscillator
Note: Keep the initial conditions of any one of the capacitor IC = 1V. (In the capacitor
attribute window).
Transient Analysis:
Print Step = 1ms
Final Time = 10ms
WAVEFORMS:
TABULAR COLUMN:
Design 1
Theoretical Frequency
Practical Frequency
RC Phase Shift Oscillator:
Design 1: f = Frequency of Oscillations = 2 KHz
T = 0.5ms
f=
1
2𝜋√6𝑅𝐶
=
0.065
𝑅𝐶
Design 2
Assume C = 0.1uF, R = 325Ω and Rf = 29 x R = 9425Ω
(R = R1 in the circuit diagram)
Voltage gain Av = RF / R1 = 29
Design 2: f = Frequency of Oscillations = 650 Hz
T = 1.53ms
f=
1
2𝜋√6𝑅𝐶
=
0.065
𝑅𝐶
Assume C = 0.1uF, R = 1K and Rf = 29k
(R = R1 in the circuit diagram)
Voltage gain Av = Rf / R1 = 29
CIRCUIT DIAGRAM: Hartley Oscillator
Note: Keep the initial conditions of both the inductors IC = 1 mA and for the
capacitor IC = 1V (In the Inductor and capacitor attribute window).
Transient Analysis:
Print Step = 1ms
Final Time = 10ms
WAVEFORMS:
1.0V
0V
-1.0V
3.468ms
3.500ms
3.550ms
3.600ms
3.650ms
3.700ms
3.750ms
V(OUT_PUT)
Time
DESIGN:
Frequency of oscillations f = 100 KHz
f=
1
2𝜋√𝐿𝐶
where L = L1 + L2
Let L1 = 100uH, L2 = 1000uH Then C = 2303pF
TABULAR COLUMN:
Theoretical Frequency (KHz)
Practical Frequency (KHz)
RESULT: Simulated RC Phase shift Oscillator and Hartley Oscillator
using 741 Opamp, Design is verified and waveforms are
noted.
3.800ms